An AMT transmission upshift process engine torque control method and system, an AMT controller and a vehicle

Abstract

The application relates to the field of engine torque control, and particularly discloses an AMT transmission upshift process engine torque control method and system, an AMT controller and a vehicle. In response to AMT transmission upshift, an engine torque reduction request is sent at a preset torque reduction slope; in response to clutch separation, the current clutch actual transmissible torque is obtained; the current clutch actual transmissible torque and the torque requested at the preset torque reduction slope are compared, and the maximum torque in the two is selected as a target torque; and the engine torque reduction request is sent at the target torque. The application controls the engine torque reduction by the AMT controller, limits the engine torque reduction by the clutch transmissible torque at the same time, and ensures that the engine torque control and the clutch separation control are cooperatively performed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine torque control, in particular to an AMT transmission upshift process engine torque control method and system, an AMT controller and a vehicle. BACKGROUND

[0002] An automated mechanical transmission (AMT) is a type of mechanical automatic transmission with automatic gear shifting, which is based on a traditional dry clutch and a manual gear transmission, and has an electronic control system installed to change the manual gear shifting mechanism into an automatic gear shifting mechanism. The AMT has the characteristics of simple structure, high transmission efficiency and low manufacturing and maintenance cost, and has a broad development prospect in the commercial vehicle field.

[0003] The current AMT torque reduction process may request an engine torque that is not synchronized with the clutch transmissible torque. If the engine torque is lower than the clutch transmissible torque, the engine may be dragged by the subsequent transmission chain, causing fluctuations in the output shaft speed of the AMT. If the engine torque is higher than the clutch transmissible torque, the clutch may be severely worn, affecting the service life of the clutch. Therefore, it is necessary to control the engine torque to ensure that the engine torque control and clutch separation control are coordinated. SUMMARY

[0004] To solve the above problems, the present application provides an AMT transmission upshift process engine torque control method and system, an AMT controller and a vehicle. The AMT controller controls the engine torque reduction while limiting the engine torque reduction with the clutch transmissible torque, ensuring that the engine torque control and clutch separation control are coordinated.

[0005] In a first aspect, the technical solution of the present application provides an AMT transmission upshift process engine torque control method, comprising the following steps:

[0006] In response to the AMT transmission upshift, an engine torque reduction request is sent at a preset torque reduction slope;

[0007] In response to the clutch separation, the current clutch actual transmissible torque is obtained;

[0008] The current clutch actual transmissible torque and the torque requested at the preset torque reduction slope are compared, and the maximum torque of the two is selected as the target torque;

[0009] The engine torque reduction request is sent at the target torque.

[0010] In an optional embodiment, the clutch actual transmissible torque is obtained, specifically including:

[0011] a clutch disengagement slope is obtained according to the vehicle state;

[0012] a clutch is disengaged with the clutch disengagement slope, and a current clutch position is obtained;

[0013] a current clutch actual transmittable torque is calculated according to a clutch torque transmission characteristic with the current clutch position.

[0014] In an optional embodiment, an initial position of the clutch disengagement is a clutch position corresponding to an engine torque at a moment when the torque reduction request is requested.

[0015] In an optional embodiment, after the engine torque reduction request is sent, the following steps are further included:

[0016] whether the clutch position reaches a preset calibration position is detected, and whether the engine torque is reduced to a friction torque is detected;

[0017] if the clutch position reaches the preset calibration position or the engine torque is reduced to the friction torque, the torque reduction is stopped.

[0018] In a second aspect, the technical solution of the present application provides an AMT transmission upshift process engine torque control system, which comprises,

[0019] a first torque reduction request sending module: an engine torque reduction request is sent with a preset torque reduction slope in response to an AMT transmission upshift;

[0020] a clutch torque obtaining module: a current clutch actual transmittable torque is obtained in response to clutch disengagement;

[0021] a torque comparison module: a current clutch actual transmittable torque and a torque requested at present with a preset torque reduction slope are compared, and a maximum torque of the two is selected as a target torque;

[0022] a second torque reduction request sending module: an engine torque reduction request is sent with the target torque.

[0023] In an optional embodiment, the clutch torque obtaining module comprises,

[0024] a clutch disengagement slope obtaining unit: a clutch disengagement slope is obtained according to the vehicle state;

[0025] a clutch position obtaining unit: a clutch is disengaged with the clutch disengagement slope, and a current clutch position is obtained;

[0026] a clutch torque calculation unit: a current clutch actual transmittable torque is calculated according to a clutch torque transmission characteristic with the current clutch position.

[0027] In an alternative embodiment, the initial position of the clutch separation is the clutch position corresponding to the engine torque at the moment of the request for the torque reduction.

[0028] In an alternative embodiment, the system further comprises,

[0029] The torque reduction stopping module: detects whether the clutch position reaches the preset calibration position and whether the engine torque reduces to the friction torque; if the clutch position reaches the preset calibration position or the engine torque reduces to the friction torque, the torque reduction is stopped.

[0030] In a third aspect, the technical solution of the present application provides an AMT controller for executing the engine torque control method for the AMT gear shifting process request.

[0031] In a fourth aspect, the technical solution of the present application provides a vehicle configured with the AMT controller.

[0032] The AMT gear shifting process request engine torque control method and system, the AMT controller and the vehicle provided by the present application have the following beneficial effects compared with the prior art: first, the engine torque is controlled at a preset torque reduction slope, and the actual clutch transmissible torque is detected at the same time, the maximum torque is selected as the target torque from the two torques, and then the engine torque is controlled at the target torque. The present application controls the engine torque reduction while the clutch transmissible torque limits the engine torque reduction at the same time, ensuring that the engine torque control and the clutch separation control are coordinated, which can effectively improve the comfort during the torque reduction in the AMT gear shifting process, and effectively solve the problems of the engine being dragged in reverse, the fluctuation of the AMT output shaft speed and the serious wear of the clutch, and the reduction of the clutch life during the AMT torque reduction process. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0034] Figure 1 is a flowchart of an AMT gear shifting process request engine torque control method provided by an embodiment of the present application.

[0035] Figure 2 is a structural schematic block diagram of an AMT gear shifting process request engine torque control system provided by an embodiment of the present application. DETAILED DESCRIPTION

[0036] For those skilled in the technical field, the present application is further described in detail below in combination with the drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0038] Figure 1 The figure is a flowchart of a method for requesting engine torque control in an AMT gear shifting process according to an embodiment of the present application. In the figure, Figure 1 The execution subject can be an AMT gear shifting process engine torque control system. The AMT gear shifting process engine torque control method provided by the embodiments of the present application is executed by a computer device, and accordingly, the AMT gear shifting process engine torque control system runs in the computer device. According to different needs, the order of steps in the flowchart can be changed, and some can be omitted.

[0039] As Figure 1 shown, the method comprises the following steps.

[0040] S1, in response to the AMT gear shifting, sending an engine torque reduction request with a preset torque reduction slope.

[0041] When the AMT gear shifting is performed, the system first detects the action. In order to ensure the smoothness of the gear shifting and the continuity of the vehicle power transmission, the engine needs to reduce the engine torque output accordingly. Therefore, according to the preset torque reduction slope, the torque amount to be reduced is calculated, and the corresponding torque reduction request is sent to the engine.

[0042] At the same time, the actual transmissible torque of the clutch is obtained, and the maximum torque is selected from the two to control the engine torque reduction. It should be noted that the AMT controller will continue to calculate the corresponding current engine torque according to the preset torque reduction slope, including the stage of controlling the engine torque reduction with the actual transmissible torque of the clutch.

[0043] S2, in response to the clutch separation, obtaining the current actual transmissible torque of the clutch.

[0044] S2.1, according to the vehicle state, obtaining the clutch separation slope by table lookup.

[0045] S2.2, clutch disengaging with clutch disengaging slope, obtaining current clutch position.

[0046] S2.3, calculating current clutch actual transmissible torque with current clutch position according to clutch torque transmission characteristic.

[0047] In the process of AMT gear shifting, the clutch will experience the process of disengaging and re-engaging. When the clutch is disengaging, its actual transmissible torque will change. The AMT controller continuously requests the clutch to disengage at a certain disengaging slope, which can be obtained by table lookup according to the vehicle state. Specifically, the disengaging slope is obtained by table lookup considering factors such as slope, throttle, gear, driving mode, etc. It should be noted that the initial position of clutch disengaging is the clutch position corresponding to the engine torque at the moment of requesting torque reduction.

[0048] The AMT controller obtains the current position of the clutch in real time according to the clutch disengaging slope, and then calculates the current clutch actual transmissible torque based on the actual torque transmission characteristic of the clutch.

[0049] S3, comparing the current clutch actual transmissible torque with the torque requested at the preset torque reduction slope, and selecting the maximum torque as the target torque.

[0050] In this embodiment, the AMT controller controls the engine torque reduction while limiting the engine torque reduction by the clutch transmissible torque. Specifically, the current clutch actual transmissible torque is compared with the torque requested at the preset torque reduction slope, and the larger one of the two torques is selected as the target torque. For example, if the torque requested at the preset torque reduction slope is greater than the current clutch actual transmissible torque, the engine torque reduction request is sent at the preset torque reduction slope; if the torque requested at the preset torque reduction slope is less than the current clutch actual transmissible torque, the engine torque reduction request is sent at the current clutch actual transmissible torque.

[0051] S4, sending the engine torque reduction request at the target torque.

[0052] After the target torque is determined, the system sends a corresponding torque reduction request to the engine. This request accurately indicates the amount of torque that needs to be reduced by the engine, to ensure the smoothness and continuity of power transmission when the clutch is re-engaged. In this embodiment, the AMT controller controls the engine torque reduction while limiting the engine torque reduction by the clutch transmissible torque, ensuring that the engine torque control and clutch disengaging control are coordinated.

[0053] S5, detecting whether the clutch position reaches the preset calibration position and whether the engine torque reduces to the friction torque; if the clutch position reaches the preset calibration position or the engine torque reduces to the friction torque, stopping the torque reduction.

[0054] The torque reduction end condition of the embodiment is that the clutch actual position separates to the vicinity of the clutch KP point (the position can be calibrated) or the engine actual torque reduces to the friction torque, the condition is met, the torque reduction process ends, the clutch is quickly separated, otherwise the torque reduction process continues.

[0055] The embodiment of the AMT transmission upshift process engine torque control method is described in detail above, based on the AMT transmission upshift process engine torque control method described in the above embodiment, the embodiment of the application also provides an AMT transmission upshift process engine torque control system corresponding to the method.

[0056] Figure 2 It is an AMT transmission upshift process engine torque control system structure schematic block diagram provided by the embodiment of the application, in the embodiment, the AMT transmission upshift process engine torque control system can be divided into multiple functional modules according to the functions it performs. The module referred to by the application refers to a series of computer program segments that can be executed by at least one processor and can complete a fixed function, which is stored in the memory.

[0057] The first torque reduction request sending module: responding to the AMT transmission upshift, sending the engine torque reduction request with the preset torque reduction slope.

[0058] The clutch torque acquisition module: responding to the clutch separation, acquiring the current clutch actual transmissible torque.

[0059] The torque comparison module: comparing the current clutch actual transmissible torque with the torque requested at the preset torque reduction slope, and selecting the maximum torque in the two as the target torque.

[0060] The second torque reduction request sending module: sending the engine torque reduction request with the target torque.

[0061] In an optional embodiment, the clutch torque acquisition module includes a clutch separation slope acquisition unit, a clutch position acquisition unit and a clutch torque calculation unit.

[0062] The clutch separation slope acquisition unit: acquiring the clutch separation slope according to the vehicle state by table lookup.

[0063] The clutch position acquisition unit: separating the clutch with the clutch separation slope, and acquiring the current clutch position.

[0064] Clutch torque calculation unit: calculates the current clutch actual transmittable torque according to clutch torque transmission characteristic with current clutch position.

[0065] In an optional embodiment, the initial position of clutch disengagement is the clutch position corresponding to the engine torque at the moment of requesting torque reduction.

[0066] In an optional embodiment, the system further comprises a torque reduction stopping module: detecting whether the clutch position reaches the preset calibration position and detecting whether the engine torque reduces to the friction torque; if the clutch position reaches the preset calibration position or the engine torque reduces to the friction torque, stopping torque reduction.

[0067] The AMT transmission upshift process engine torque control system of the embodiment is used to implement the aforementioned AMT transmission upshift process engine torque control method, and thus the specific embodiments in the system can be found in the aforementioned embodiment part of the AMT transmission upshift process engine torque control method, and thus the specific embodiments can be referred to the description of the corresponding embodiment part, and will not be introduced here.

[0068] In addition, since the AMT transmission upshift process engine torque control system of the embodiment is used to implement the aforementioned AMT transmission upshift process engine torque control method, its role corresponds to the role of the aforementioned method, and thus will not be described here.

[0069] The embodiment provides an AMT controller, which executes the AMT transmission upshift process engine torque control method of the aforementioned embodiment.

[0070] The embodiment provides a vehicle, which is configured with the AMT controller of the aforementioned embodiment.

[0071] The above disclosure is only the preferred embodiment of the present application, but the present application is not limited to this, any person skilled in the art can think of non-creative changes, and several improvements and refinements made without departing from the principles of the present application, should fall within the scope of protection of the present application.

Claims

1. A method for requesting engine torque control during upshifting in an AMT transmission, characterized in that, Includes the following steps: In response to the AMT transmission upshift, a torque reduction request is sent to the engine with a preset torque reduction slope; In response to clutch disengagement, obtain the actual transmittable torque of the current clutch; The actual torque that the clutch can transmit is compared with the torque requested at the current torque reduction slope, and the maximum torque of the two is selected as the target torque. Send an engine torque reduction request with the target torque.

2. The method for requesting engine torque control during the upshifting process of an AMT transmission according to claim 1, characterized in that, To obtain the actual transmittable torque of the current clutch, specifically including: The clutch disengagement slope is obtained by looking up a table based on the vehicle's status. Disengage the clutch using the clutch disengagement slope to obtain the current clutch position; The actual transmittable torque of the clutch at the current clutch position is calculated based on the clutch's torque transmission characteristics.

3. The method for requesting engine torque control during the upshifting process of an AMT transmission according to claim 2, characterized in that, The initial clutch disengagement position is the clutch position corresponding to the engine torque at the instant torque reduction is requested.

4. The method for requesting engine torque control during upshifting of an AMT transmission according to any one of claims 1-3, characterized in that, After sending the engine torque reduction request, the following steps are also included: Check whether the clutch position has reached the preset calibration position and check whether the engine torque has dropped to the friction torque; If the clutch position reaches the preset calibration position or the engine torque drops to the friction torque, the torque reduction will stop.

5. An AMT transmission upshifting process request engine torque control system, characterized in that, include: First torque reduction request sending module: responds to AMT transmission upshift and sends engine torque reduction request with preset torque reduction slope; Clutch torque acquisition module: In response to clutch disengagement, acquire the actual transmittable torque of the current clutch; Torque Comparison Module: Compares the actual torque that the clutch can transmit with the torque requested at the current preset torque reduction slope, and selects the maximum torque between the two as the target torque; Second torque reduction request sending module: Sends engine torque reduction request with target torque.

6. The AMT transmission upshift process request engine torque control system according to claim 5, characterized in that, The clutch torque acquisition module includes: Clutch disengagement slope acquisition unit: Obtains the clutch disengagement slope by looking up a table based on the vehicle status; Clutch position acquisition unit: Disengages the clutch using the clutch disengagement slope to acquire the current clutch position; Clutch torque calculation unit: Calculates the actual transmittable torque of the current clutch based on the clutch torque transmission characteristics and the current clutch position.

7. The AMT transmission upshift process request engine torque control system according to claim 6, characterized in that, The initial clutch disengagement position is the clutch position corresponding to the engine torque at the instant torque reduction is requested.

8. The AMT transmission upshift process request engine torque control system according to any one of claims 5-7, characterized in that, The system also includes: Torque reduction stop module: detects whether the clutch position has reached the preset calibration position and whether the engine torque has dropped to the friction torque; if the clutch position reaches the preset calibration position or the engine torque drops to the friction torque, the torque reduction stops.

9. An AMT controller, characterized in that, The method for requesting engine torque control during the upshifting process of an AMT transmission as described in any one of claims 1-4 is hereby implemented.

10. A vehicle, characterized in that, Configure the AMT controller as described in claim 9.

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